Remove //build/android/ from base exclusions in trybot_analyze_config.json.

Most of this should be unnecessary now that the GN rules for the tests
list the pylibs as data.

See https://chromium-review.googlesource.com/c/chromium/src/+/1291711/2
for an example CQ run of a change that touched //build/android/ w/ this
patch applied. It ran all the tests on the android bots, but was mostly
a no-op for the other bots.

R=jbudorick, dpranke

Change-Id: I25ba6260652508994144eb3d8e4bd7304a863e88
Reviewed-on: https://chromium-review.googlesource.com/c/1291782
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601262}